The black version of the Sennheiser Momentum 2 Lifestyle Around-Ear Hifi Headphones feature an integrated smartphone remote control and microphone cable for managing media and making calls on your iOS mobile device. The design features closed-back earcups that help isolate from environmental noise and encase proprietary dynamic 18 ohm neodymium transducers to drive extra large diaphragms for clear highs and powerful bass over a frequency response of 16 to 22,000 Hz.